[turbofan] Introduce prediction for exception handlers.

src/compiler/common-operator.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/common-operator.h"
 
 #include "src/assembler.h"
 #include "src/base/lazy-instance.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/opcodes.h"
@@ skipping 18 matching lines @@
   return os;
 }
 
 
 BranchHint BranchHintOf(const Operator* const op) {
   DCHECK_EQ(IrOpcode::kBranch, op->opcode());
   return OpParameter<BranchHint>(op);
 }
 
 
+size_t hash_value(IfExceptionHint hint) { return static_cast<size_t>(hint); }
+
+
+std::ostream& operator<<(std::ostream& os, IfExceptionHint hint) {
+  switch (hint) {
+    case IfExceptionHint::kLocallyCaught:
+      return os << "Caught";
+    case IfExceptionHint::kLocallyUncaught:
+      return os << "Uncaught";
+  }
+  UNREACHABLE();
+  return os;
+}
+
+
 bool operator==(SelectParameters const& lhs, SelectParameters const& rhs) {
   return lhs.type() == rhs.type() && lhs.hint() == rhs.hint();
 }
 
 
 bool operator!=(SelectParameters const& lhs, SelectParameters const& rhs) {
   return !(lhs == rhs);
 }
 
 
@@ skipping 49 matching lines @@
   os << i.index();
   return os;
 }
 
 
 #define CACHED_OP_LIST(V)                                  \
   V(Dead, Operator::kFoldable, 0, 0, 0, 0, 0, 1)           \
   V(IfTrue, Operator::kKontrol, 0, 0, 1, 0, 0, 1)          \
   V(IfFalse, Operator::kKontrol, 0, 0, 1, 0, 0, 1)         \
   V(IfSuccess, Operator::kKontrol, 0, 0, 1, 0, 0, 1)       \
-  V(IfException, Operator::kKontrol, 0, 0, 1, 1, 0, 1)     \
   V(IfDefault, Operator::kKontrol, 0, 0, 1, 0, 0, 1)       \
   V(Throw, Operator::kKontrol, 1, 1, 1, 0, 0, 1)           \
   V(Deoptimize, Operator::kNoThrow, 1, 1, 1, 0, 0, 1)      \
   V(Return, Operator::kNoThrow, 1, 1, 1, 0, 0, 1)          \
   V(Terminate, Operator::kKontrol, 0, 1, 1, 0, 0, 1)       \
   V(OsrNormalEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1) \
   V(OsrLoopEntry, Operator::kFoldable, 0, 1, 1, 0, 1, 1)
 
 
 #define CACHED_END_LIST(V) \
@@ skipping 84 matching lines @@
     Name##Operator()                                                         \
         : Operator(IrOpcode::k##Name, properties, #Name, value_input_count,  \
                    effect_input_count, control_input_count,                  \
                    value_output_count, effect_output_count,                  \
                    control_output_count) {}                                  \
   };                                                                         \
   Name##Operator k##Name##Operator;
   CACHED_OP_LIST(CACHED)
 #undef CACHED
 
+  template <IfExceptionHint kCaughtLocally>
+  struct IfExceptionOperator final : public Operator1<IfExceptionHint> {
+    IfExceptionOperator()
+        : Operator1<IfExceptionHint>(                      // --
+              IrOpcode::kIfException, Operator::kKontrol,  // opcode
+              "IfException",                               // name
+              0, 0, 1, 1, 0, 1,                            // counts
+              kCaughtLocally) {}                           // parameter
+  };
+  IfExceptionOperator<IfExceptionHint::kLocallyCaught> kIfExceptionCOperator;
+  IfExceptionOperator<IfExceptionHint::kLocallyUncaught> kIfExceptionUOperator;
+
   template <size_t kInputCount>
   struct EndOperator final : public Operator {
     EndOperator()
         : Operator(                                // --
               IrOpcode::kEnd, Operator::kKontrol,  // opcode
               "End",                               // name
               0, 0, kInputCount, 0, 0, 0) {}       // counts
   };
 #define CACHED_END(input_count) \
   EndOperator<input_count> kEnd##input_count##Operator;
@@ skipping 155 matching lines @@
     case BranchHint::kTrue:
       return &cache_.kBranchTrueOperator;
     case BranchHint::kFalse:
       return &cache_.kBranchFalseOperator;
   }
   UNREACHABLE();
   return nullptr;
 }
 
 
+const Operator* CommonOperatorBuilder::IfException(IfExceptionHint hint) {
+  switch (hint) {
+    case IfExceptionHint::kLocallyCaught:
+      return &cache_.kIfExceptionCOperator;
+    case IfExceptionHint::kLocallyUncaught:
+      return &cache_.kIfExceptionUOperator;
+  }
+  UNREACHABLE();
+  return nullptr;
+}
+
+
 const Operator* CommonOperatorBuilder::Switch(size_t control_output_count) {
   DCHECK_GE(control_output_count, 3u);        // Disallow trivial switches.
   return new (zone()) Operator(               // --
       IrOpcode::kSwitch, Operator::kKontrol,  // opcode
       "Switch",                               // name
       1, 0, 1, 0, 0, control_output_count);   // counts
 }
 
 
 const Operator* CommonOperatorBuilder::IfValue(int32_t index) {
@@ skipping 334 matching lines @@
   } else {
     UNREACHABLE();
     return nullptr;
   }
 }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8